Re: [PATCH 05/23] scsi_transport_fc: add a max_bsg_segments field to struct fc_function_template

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On 4/2/24 15:06, Christoph Hellwig wrote:
ibmvfc only supports a single segment for BSG FC passthrough.  Instead of
having it set a queue limits after creating the BSD queues, add a field so
that the FC transport can set it before allocating the queue.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
---
  drivers/scsi/ibmvscsi/ibmvfc.c   | 5 +----
  drivers/scsi/scsi_transport_fc.c | 2 ++
  include/scsi/scsi_transport_fc.h | 1 +
  3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 05b126bfd18b55..a3d1013c83075c 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -5541,8 +5541,6 @@ static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
  			rport->supported_classes |= FC_COS_CLASS2;
  		if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
  			rport->supported_classes |= FC_COS_CLASS3;
-		if (rport->rqst_q)
-			blk_queue_max_segments(rport->rqst_q, 1);
  	} else
  		tgt_dbg(tgt, "rport add failed\n");
  	spin_unlock_irqrestore(vhost->host->host_lock, flags);
@@ -6391,8 +6389,6 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
ibmvfc_init_sub_crqs(vhost); - if (shost_to_fc_host(shost)->rqst_q)
-		blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
  	dev_set_drvdata(dev, vhost);
  	spin_lock(&ibmvfc_driver_lock);
  	list_add_tail(&vhost->queue, &ibmvfc_head);
@@ -6547,6 +6543,7 @@ static struct fc_function_template ibmvfc_transport_functions = {
  	.get_starget_port_id = ibmvfc_get_starget_port_id,
  	.show_starget_port_id = 1,
+ .max_bsg_segments = 1,
  	.bsg_request = ibmvfc_bsg_request,
  	.bsg_timeout = ibmvfc_bsg_timeout,
  };
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 0799700b0fca77..7d088b8da07578 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -4288,6 +4288,7 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
  	snprintf(bsg_name, sizeof(bsg_name),
  		 "fc_host%d", shost->host_no);
  	scsi_init_limits(shost, &lim);
+	lim.max_segments = min_not_zero(lim.max_segments, i->f->max_bsg_segments);
  	q = bsg_setup_queue(dev, bsg_name, &lim, fc_bsg_dispatch,
  			fc_bsg_job_timeout, i->f->dd_bsg_size);
  	if (IS_ERR(q)) {
@@ -4320,6 +4321,7 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
  		return -ENOTSUPP;
scsi_init_limits(shost, &lim);
+	lim.max_segments = min_not_zero(lim.max_segments, i->f->max_bsg_segments);
  	q = bsg_setup_queue(dev, dev_name(dev), &lim, fc_bsg_dispatch_prep,
  				fc_bsg_job_timeout, i->f->dd_bsg_size);
  	if (IS_ERR(q)) {
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index 483513c575976c..fd039306ffbb20 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -709,6 +709,7 @@ struct fc_function_template {
  	int  	(*vport_delete)(struct fc_vport *);
/* bsg support */
+	u32				max_bsg_segments;
  	int	(*bsg_request)(struct bsg_job *);
  	int	(*bsg_timeout)(struct bsg_job *);
That looks like an odd alignment...

Anyway:
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@xxxxxxx                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich





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